Added basic playmode test

Assets/Tests.meta

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Assets/Tests/EditMode.meta

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Assets/Tests/EditMode/EditMode.asmdef

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+{
+    "name": "EditMode",
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ]
+}

Assets/Tests/EditMode/EditMode.asmdef.meta

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Assets/Tests/EditMode/EditMode.cs

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+using System.Collections;
+using System.Collections.Generic;
+using NUnit.Framework;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+public class EditMode
+{
+    // A Test behaves as an ordinary method
+    [Test]
+    public void EditModeSimplePasses()
+    {
+        // Use the Assert class to test conditions
+    }
+
+    // A UnityTest behaves like a coroutine in Play Mode. In Edit Mode you can use
+    // `yield return null;` to skip a frame.
+    [UnityTest]
+    public IEnumerator EditModeWithEnumeratorPasses()
+    {
+        // Use the Assert class to test conditions.
+        // Use yield to skip a frame.
+        yield return null;
+    }
+}

Assets/Tests/EditMode/EditMode.cs.meta

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Assets/Tests/PlayMode.meta

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Assets/Tests/PlayMode/MainMenuTest.cs

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+using System.Collections;
+using NUnit.Framework;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.SceneManagement;
+using UnityEngine.TestTools;
+
+public class MainMenuTest {
+	[UnitySetUp]
+	public IEnumerator SetUp() {
+		yield return EditorSceneManager.LoadSceneAsyncInPlayMode(
+			"Assets/Scenes/SampleScene.unity",
+			new LoadSceneParameters(LoadSceneMode.Single)
+		);
+	}
+
+	[Test]
+	public void OnlyOneEventSystem() {
+		EventSystem[] eventSystems = Object.FindObjectsOfType<EventSystem>();
+		Assert.AreEqual(1, eventSystems.Length);
+	}
+
+	[Test]
+	public void StartIsSelected() {
+		var eventSystem = Object.FindObjectOfType<EventSystem>();
+		Assert.NotNull(eventSystem);
+		
+		GameObject currentSelected = eventSystem.currentSelectedGameObject;
+		Assert.NotNull(currentSelected);
+
+		// Maybe find other way than string compare?
+		Assert.AreEqual("Start Button", currentSelected.name);
+	}
+}

Assets/Tests/PlayMode/MainMenuTest.cs.meta

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Assets/Tests/PlayMode/PlayMode.asmdef

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+{
+    "name": "PlayMode",
+    "optionalUnityReferences": [
+        "TestAssemblies"
+    ]
+}

Assets/Tests/PlayMode/PlayMode.asmdef.meta

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